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Thread: Maximum distance for horizontal bathroom DWV?

  1. #1
    DIY Member benze's Avatar
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    Default Maximum distance for horizontal bathroom DWV?

    Hi,

    This may be code/region dependent, but I was wondering if there was a maximum length/distance (logically or otherwise) for a bathroom DWV line. I'm looking to add a half storey to the house, and where I want to locate my new master bathroom would cause some semi-significant demo work in a fairly new kitchen underneath to put in a DWV in the wall. On the other hand, I have a fairly innocuous area that I can run it at the front of the house, but it would have a 40-50 foot run from the bathroom to the stack in the front of the house. Given a 1/4"/foot slope, I figure I would need nearly a foot of drop from the bathroom to the vertical stack.

    Is a 50 foot run considered bad practice if the slope is maintained throughout? Is there a minimum size that I have to run given the distance? If I need 45 to make a couple of bends, is that an issue? From what I understand, minimum size for bathroom drain in 3"; would I need to go 4"?

    Thanks!

    Eric

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    There is a requirement on the maximum number of degrees the pipe can turn before you need a cleanout, but distance should not be a problem if the slope is maintained. Think about the drain line after it typically exits the house...it could be hundreds of feet before it meets up with the area's sewer line - distance isn't the issue, it's the slope - no flat spots, no bellies, a consistant drop of at least 1/4" per foot (2%).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Member benze's Avatar
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    Quote Originally Posted by jadnashua View Post
    Think about the drain line after it typically exits the house...it could be hundreds of feet before it meets up with the area's sewer line - distance isn't the issue, it's the slope - no flat spots, no bellies, a consistant drop of at least 1/4" per foot (2%).
    That was pretty much my thought process and expectation as well. I had not considered the issue with the cleanout however.

    Does anyone know the requirements for max turns before a cleanout? (I realize that this will likely be governed by code, but just looking for a rough idea).

    Thanks,

    Eric

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    Forum Admin, Expert Plumber Terry's Avatar
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    You can go 135 degrees between cleanouts.
    That's a 90 and a 45

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    Moderator & Master Plumber hj's Avatar
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    Here it is 90 degrees, but 135 degrees for a trap arm.
    Licensed residential and commercial plumber

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